Is there a quotative verb (or one I can abuse as a quotative) that means "to voice [a] concern"? (Other than "worried"?)

"Hey, uh... guys," I _____ed, "it looks like it's getting bigger..."

There are a bunch of verbs for complaining (grouse, gripe, whine), there's "warn" if I want to be more definite, but is there a word for 'concerned, but uncertain'? ("Flagged" would sort-of worked except that'd be a real stretch as a quotative. "Advised" is also 'close, but not quite'.)